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VAV SYSTEM FEATURES ( One Of Many Types ) Electric or Pneumatic or Digital Controls “In Duct” &/or “At Diffuser” Locations Pressure, Temperature And/Or Flow Sensors ------------------------------------------- VAV The Current State Of Technology In HVAC ! Good site to visit & see animations of various VAV systems types! How different systems work and why ! POSSIBLE MAIN DUCT VAV Fan Speed > Current Basic Commercial HVAC Systems VAVs partial open Typically Fan 17

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HVAC General Rules of Installation Distance from InDuct to Air Outlets. Do not exceed 20 meters It’s more of an art than a science. Even the Pros don’t always agree !

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GENERAL COMMERCIAL “Duct Cell” PLACEMENT. You Have Two Options ! 1] You can place ALL duct cell units in the “plenum”. OR IF there are reasons that this approach might not work; 2] Then review the duct blueprint and split the duct system into sections that have approximately the “ =< ft 2 coverage” of the duct cell you have selected. Then place a cell at any suitable upstream “insertion point” for that section. REMEMBER: Sq Ft coverage ( 8’ ceilings) ~= CFM Sum-total cfm = 3000 400 cfm 400 cfm 500 cfm 500 cfm 600 cfm 600 cfm 500 cfm 500 cfm 1000 cfm 1000 cfm 300 ft duct Plus an In-line VAV valve Sum-total cfm=3000 6000 cfm